The meta-analysis study you cite suggests 2% loss @ 5 days and 5% loss at 10 days at the knee extensor muscles. Notice that percentage loss is more than double

The meta-analysis study you cite suggests 2% loss @ 5 days and 5% loss at 10 days at the knee extensor muscles. Notice that percentage loss is more than double for a doubling of bedrest time. It's not linear. You're suggesting that muscle loss at the knee extensor is the same percentage for the rest of the body. from the full text of the bedrest study mentioned in the outsideonline.com article - muscle loss was measured via DXA scan. see https://diabetesjournals.org/diabetes/article/65/10/2862/35009/One-Week-of-Bed-Rest-Leads-to-Substantial-Muscle https://diabetesjournals.org/diabetes/article/65/10/2862/350... After 1 week of bed rest, participants lost 1.4 ± 0.2 kg (range: 0.6 to 2.8 kg) lean tissue mass (Fig. 1A) (P < 0.01), representing a 2.5 ± 0.4% loss of lean tissue mass.